Abstract
Sweetpotato (Ipomoea batatas (L.) Lam.) is a globally significant storage root crop, but it is highly susceptible to yield reduction under severe drought conditions. Therefore, understanding the mechanism of sweetpotato resistance to drought stress is helpful for the creation of outstanding germplasm and the selection of varieties with strong drought resistance. In this study, we conducted a comprehensive analysis of the phenotypic and physiological traits of 17 sweetpotato breeding lines and 10 varieties under drought stress through a 48 h treatment in a Hoagland culture medium containing 20% PEG6000. The results showed that the relative water content (RWC) and vine-tip fresh-weight reduction (VTFWR) in XS161819 were 1.17 and 1.14 times higher than those for the recognized drought-resistant variety Chaoshu 1. We conducted RNA-seq analysis and weighted gene co-expression network analysis (WGCNA) on two genotypes, XS161819 and 18-12-3, which exhibited significant differences in drought resistance. The transcriptome analysis revealed that the hormone signaling pathway may play a crucial role in determining the drought resistance in sweetpotato. By applying WGCNA, we identified twenty-two differential expression modules, and the midnight blue module showed a strong positive correlation with drought resistance characteristics. Moreover, twenty candidate Hub genes were identified, including g47370 (AFP2), g14296 (CDKF), and g60091 (SPBC2A9), which are potentially involved in the regulation of drought resistance in sweetpotato. These findings provide important insights into the molecular mechanisms underlying drought resistance in sweetpotato and offer valuable genetic resources for the development of drought-resistant sweetpotato varieties in the future.
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Claims 8
Claim · model-written summary
Under PEG drought, XS161819 had a relative water content 1.17 times higher than Chaoshu 1.
- Taxon
- Sweetpotato
_Flower.jpg?width=60)
Ipomoea batatast0 - Material
- XS161819e1
- Treatment
- 48 h treatment in a Hoagland culture medium containing 20% PEG6000e2
- Outcome
- relative water content (RWC)e1
- Direction
- highere1
- Value
- 1.17e1
- Qualifier
- times highere1
- Comparator
- Chaoshu 1e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_Flower.jpg?width=500)
Verbatim
t0“Sweetpotato”
e1“The results showed that the relative water content (RWC) and vine-tip fresh-weight reduction (VTFWR) in XS161819 were 1.17 and 1.14 times higher than those for the recognized drought-resistant variety Chaoshu 1”
e2“48 h treatment in a Hoagland culture medium containing 20% PEG6000”
Claim · model-written summary
Under PEG drought, XS161819 had a vine-tip fresh-weight reduction 1.14 times higher than Chaoshu 1.
- Taxon
- SweetpotatoIpomoea batatast0
- Material
- XS161819e1
- Treatment
- 48 h treatment in a Hoagland culture medium containing 20% PEG6000e2
- Outcome
- vine-tip fresh-weight reduction (VTFWR)e1
- Direction
- highere1
- Value
- 1.14e1
- Qualifier
- times highere1
- Comparator
- Chaoshu 1e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Sweetpotato”
e1“The results showed that the relative water content (RWC) and vine-tip fresh-weight reduction (VTFWR) in XS161819 were 1.17 and 1.14 times higher than those for the recognized drought-resistant variety Chaoshu 1”
e2“48 h treatment in a Hoagland culture medium containing 20% PEG6000”
Claim · model-written summary
Genotypes XS161819 and 18-12-3 differed significantly in drought resistance.
- Taxon
- SweetpotatoIpomoea batatast0
- Material
- XS161819 and 18-12-3e3
- Outcome
- drought resistancee3
- Qualifier
- significant differencese3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Sweetpotato”
e3“two genotypes, XS161819 and 18-12-3, which exhibited significant differences in drought resistance”
Claim · model-written summary
The hormone signaling pathway may play a crucial role in determining drought resistance in sweetpotato.
- Taxon
- SweetpotatoIpomoea batatast0
- Outcome
- drought resistancee4
- Qualifier
- hormone signaling pathwaye4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Sweetpotato”
e4“the hormone signaling pathway may play a crucial role in determining the drought resistance in sweetpotato”
Claim · model-written summary
Twenty-two differential expression modules were identified by WGCNA.
- Taxon
- SweetpotatoIpomoea batatast0
- Outcome
- differential expression modulese5
- Value
- twenty-twoe5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Sweetpotato”
e5“By applying WGCNA, we identified twenty-two differential expression modules, and the midnight blue module showed a strong positive correlation with drought resistance characteristics”
Claim · model-written summary
The midnight blue module is positively correlated with drought resistance characteristics.
- Taxon
- SweetpotatoIpomoea batatast0
- Gene
- midnight blue modulee5
- Outcome
- drought resistance characteristicse5
- Direction
- positivee5
- Qualifier
- stronge5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Sweetpotato”
e5“By applying WGCNA, we identified twenty-two differential expression modules, and the midnight blue module showed a strong positive correlation with drought resistance characteristics”
Claim · model-written summary
Twenty candidate hub genes were identified.
- Taxon
- SweetpotatoIpomoea batatast0
- Outcome
- candidate Hub genese6
- Value
- twentye6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Sweetpotato”
e6“Moreover, twenty candidate Hub genes were identified, including g47370 (AFP2), g14296 (CDKF), and g60091 (SPBC2A9), which are potentially involved in the regulation of drought resistance in sweetpotato”
Claim · model-written summary
Hub genes g47370 (AFP2), g14296 (CDKF) and g60091 (SPBC2A9) are potentially involved in regulating drought resistance in sweetpotato.
- Taxon
- SweetpotatoIpomoea batatast0
- Gene
- g47370 (AFP2), g14296 (CDKF), and g60091 (SPBC2A9)e6
- Outcome
- drought resistancee6
- Qualifier
- potentially involved in the regulatione6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Sweetpotato”
e6“Moreover, twenty candidate Hub genes were identified, including g47370 (AFP2), g14296 (CDKF), and g60091 (SPBC2A9), which are potentially involved in the regulation of drought resistance in sweetpotato”
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